High-precision VLBI astrometric observations of radio-emitting stars for detection of extra-solar planets |
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| Authors: | Jean-François Lestrade Dayton L Jones Robert A Preston Robert B Phillips |
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| Institution: | (1) Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA;(2) Haystack Observatory, Massachusetts Institute of Technology, Westford, Massachusetts, USA |
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| Abstract: | The displacement of a radio-emitting star around the barycenter of a possible planetary system can be measured by astrometric very long baseline interferometry (VLBI) observations. We have observed the radio-emitting star
2 CrB at 8 epochs over 5 years by VLBI and fitted its 5 astrometric parameters to the observed coordinates. The post-fit coordinate residuals have an rms scatter of 0.22 milliarcseconds and show no systematic behavior. We use this result to set a limit on the presence of planets around
2 CrB and conclude that our present VLBI astrometric precision corresponds to the threshold to detect a Jupiter-like planet around this star. We also discuss the astrometric monitoring program of 11 radio-emitting stars that we are conducting for the Hipparcos space mission and its possible contribution to a long-term planet search program.Paper presented at the Conference onPlanetary Systems: Formation, Evolution, and Detection held 7–10 December, 1992 at CalTech, Pasadena, California, U.S.A. |
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